it simple like i explained to a person about how often the snake was going for there to be waste a couple things need to be met 1 they must intake something first, they remove all the good from the food and 3 there has to be enought waste for them to need to go. I had showed a guy one snake that just happen to go while he was there and pointed out that little amount of waste was from the snake consumings 2-3 rats.(boa was the snake ) i think he almost puked right there when i showed him a full grown rat and pointed out that the poo was 2-3 rats reduced ..